US6180894B1 - Dual mode digitizer tablet system - Google Patents

Dual mode digitizer tablet system Download PDF

Info

Publication number
US6180894B1
US6180894B1 US09074640 US7464098A US6180894B1 US 6180894 B1 US6180894 B1 US 6180894B1 US 09074640 US09074640 US 09074640 US 7464098 A US7464098 A US 7464098A US 6180894 B1 US6180894 B1 US 6180894B1
Authority
US
Grant status
Grant
Patent type
Prior art keywords
frequency
tablet
system
signal
device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US09074640
Inventor
Ching-Chuan Chao
Chia-Jui Yeh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Waltop International Corp
Original Assignee
Aiptek International Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date

Links

Images

Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/038Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/046Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/038Indexing scheme relating to G06F3/038
    • G06F2203/0384Wireless input, i.e. hardware and software details of wireless interface arrangements for pointing devices

Abstract

An apparatus for automatically changing the operation of a dual-mode digitizer tablet system. The system comprises a cordless pen device generating an electromagnetic wave of a variable frequency and a cordless mouse device generating an electromagnetic wave of a different frequency. The cordless pen device operates in an absolute mode and the cordless mouse device operates in a relative movement mode. The apparatus comprises a detection loop sensing circuit for detecting electromagnetic waves and a signal processing circuit for extracting the signal of either the pen device or the mouse device. The extracted signal is rectified and digitized for determining the position of the cordless pointing device by a micro-controller. A frequency counter determines the frequency of the detected signal. By detecting and determining the frequency of the electromagnetic wave received in the tablet system, the operation mode is adjusted automatically.

Description

FIELD OF THE INVENTION

The present invention relates to a dual mode digitizer tablet system comprising a tablet and cordless pointing devices, and more specifically to the operation mode switching between a cordless mouse and a cordless pen.

BACKGROUND OF THE INVENTION

A typical prior art tablet digitizer system has a tablet and a transducer/cursor in the form of a pen or a puck. As is well known, there are two operation modes for determining the position of a pointing device on the surface of a digitizer tablet. One is a relative mode, and the other is an absolute mode.

A mouse device operates in a relative mode. The computer sensing the inputs from a mouse recognizes only relative movements of the mouse in X and Y directions as it is slid over the surface on which it is resting. If the mouse is lifted and repositioned on the surface, no change in the signal to the computer will be detected. A common approach uses a sensing apparatus inside the mouse to develop a pair of changing signals corresponding to the longitudinal and transversal movements of the mouse.

In contrast, a cursor device (such as a pen or a puck) in a digitizer tablet system operates in an absolute mode. If a cursor device is lifted and moved to a new position on its supporting surface, its signal to a computer will change to reflect the new absolute position of the cursor device. Various methods have been used to determine the position of a cursor device on the surface of its supporting tablet. One common approach is electromagnetic field sensing.

Early transducer/cursors were connected to the tablet by means of a multi-conductor cable through which the position and button/pressure information are transferred virtually without any problem. As cordless pointing devices become popular, it is critical that the button functions and positional status of a pointing device can be passed efficiently and correctly.

The cordless transducer/cursors in some of the prior arts have attempted to use frequency and/or phase changes to transmit the non-positional status of the transducer/cursor functions such as buttons pushed, pen pressure, or the like. However, if there is no sophisticated processing, frequency and phase changes are very prone to false reading resulting from several outside factors such as metal objects, noise, wireless electromagnetic wave and so on. These problems become more apparent, especially in a larger digitizer tablet.

Improvements have also been made in the prior arts to allow a user to use pointing devices on a digitizer tablet system in dual modes of operation that can provide information of either a relative movement or an absolute position under the control of the user.

However, this type of system has some disadvantages. One is that operating the pointing device in either a relative mode or an absolute mode is user-controlled but not automatically detected by the digitizer tablet system itself. Another disadvantage is that a position history table means is needed in order for the user to selectively control the use of the cursor device as an absolute position or as a relative movement device.

From the foregoing discussions, there is a need in the art for effectively and automatically detecting the pointing devices in a digitizer tablet system so that the digitizer tablet system may accommodate the dual operation modes by itself.

SUMMARY OF THE INVENSION

This invention has been made to overcome the above mentioned drawbacks and inefficiencies for a digitizer tablet system comprising a tablet and cordless pointing devices. A principle object of the present invention is to provide a digitizer tablet system that receives the input signals from the pointing devices and is adjusted to accommodate changing circumstances, in order to automatically characterize the pointing devices. Also, it allows user selectively control the use of the pointing device as an absolute position device or as a relative movement device on the surface of the digitizer tablet system.

In accomplishing that object, it is another object of the present invention to provide a method and an apparatus for automatically detecting the frequencies of the input signals from the pointing devices. The intelligent digitizer tablet system of the present invention is adjusted to accommodate the changing operation modes of the pointing devices based on the frequency of the received signal.

It is a further object of the invention to provide a principle that can easily obtain the relative movement (such as mouse) or absolute position (such as pen) on the surface of the tablet system for the pointing devices. Accordingly, the digitizer tablet system of the present invention can increase operation accuracy, calculate the coordinate position at a very high speed, and save the electrical power for the whole system.

The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the detailed description provided below, with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a simplified top view of a digitizer according to a preferred embodiment of the present invention.

FIG. 2 is a block diagram showing the overall architecture and operations of the present invention for using a digitizer such as that of FIG. 1 when employing a cordless pen.

FIG. 3 shows different frequency bands of the frequency spectrum employed in a preferred embodiment of the present invention.

FIG. 4 is a flow chart showing the steps in the method of the present invention for determining an operation mode when employing a pointing device on a dual-mode digitizer tablet system.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring now to FIG. 1, a digitizer tablet system 100 is shown according to one embodiment of the present invention. Digitizer tablet system 100 comprises a cordless pen 101, a cordless mouse 102 and a tablet system 103. The cordless mouse 102 transmits an electromagnetic wave. The cordless pen 101 is capable of transmitting a variable frequency electromagnetic wave. The tablet system 103 automatically detects the signal from either the cordless pen 101 or the cordless mouse 102 to accommodate the operation mode change between the cordless pen 101 and the cordless mouse 102.

FIG. 2 is a block diagram showing the overall architecture and operations of the present invention for using a cordless pen in a digitizer tablet system of FIG. 1. The PCB (printed circuit board) in the tablet system 103 of FIG. 1 is covered with detection loop sensing circuits on its top and bottom sides. The detection loop sensing circuit 201 as shown in FIG. 2 is divided into two sensing systems, one for the X-axis and the other for the Y-axis. The surface of the detection loop sensing circuit 201 is covered with a shielding copper wire loop to prevent interference from noise.

When the digitizer tablet system is turned on, a system timing clock generator (not shown) scans X-axis and Y-axis of the global area at each predetermined time slot according to the order of encoding circuit. Under the control of a de-multiplexer, detection loop sensing circuit 201 starts scanning from the initial point extending in the X-direction and Y-direction by the means of time-sharing and multitasking. And, the received electromagnetic wave signal is sequentially sent to a multi-channel selector, an inverted amplifier 203, a feedback amplifier 204 and a high order band pass filter 205. The signal can be isolated from noise, and the original analog signal is completely recovered from the signal.

The output of the band pass filter 205 is sent to two different paths. The first path includes a half-wave rectifier, a peak detector and a low pass filter 206. In the first path, the signal is half-wave rectified and then sent to an analog to digital converter 208 in a micro-controller 207. The digitized signal is stored in the data memory in the micro-controller. The position of the cordless pen can be calculated using a conventional approach which is not the subject of this invention.

After obtaining the X-coordinate and Y-coordinate of the pen position in the global area from the signals, the digitizer tablet system changes its method of scanning. The scanning area only focuses on the local area around the reference position which is found in the global scanning. The signals obtained from the scanned local area are also sent to the same circuit mentioned above to be processed and calculated. In this manner, a new X and Y coordinates can be achieved by only adding offset values to the reference position.

Because new X and Y coordinates are achieved without re-scanning the global area, the digitizer tablet system of the present invention can increase operation accuracy, calculate the coordinate position at a very high speed, and save the electrical power for the whole system.

While the coordinates for the received signals are determined, the output signal of the band-pass filter is also sent to the second path. The signal is passed through a signal shaping circuit to shape sine waves into square waves. A frequency divider then converts the signal into a square wave of lower frequency for frequency counting.

The characteristic for the signal frequency can determine whether the signal comes from a cordless mouse or a cordless pen. The method for determining the signal sources is illustrated in more detail in FIG. 3 and the flow chart of FIG. 4. If the signal comes from a cordless mouse, the operation of the digitizer tablet system is switched into a relative mode. On the other hand, if the signal comes from a cordless pen, the operation of the digitizer tablet system is switched into an absolute mode.

As shown in FIG. 3, the frequency bandwidth of electromagnetic waves is divided into several sections. Each section is reserved for a certain function of a particular pointing device. As can be seen from the example of FIG. 3, the basic operating frequency of the cordless mouse is between 171.6 kHz and 173 kHz. The frequency between 151 kHz and 169.6 kHz is reserved for the first button (tip switch on) of the cordless pen. The signal for the first button (left button) of the mouse has an operating frequency between 145 kHz and 150 kHz. The frequency bands from 136.8 kHz to 139.2 kHz, 131 kHz to 134 kHz and 124 kHz to 129 kHz are reserved for the second, third and fourth buttons of the cordless pen respectively. A guard band exists between every two frequency bands to help the distinction of two functions.

The preferred embodiment of this invention uses the frequency bandwidth as described above. These frequency bands are stored in the micro-controller as reference points. When a signal is received, the operation of the tablet can be switched to a correct mode based on these reference points.

There are several factors in selecting the frequency band for the tablet system of this invention. As is known, the screen of a computer terminal is easily interfered by electromagnetic waves below 100 kHz. The speed of scanning process may be too low when the frequency used in a digitizer is lower than 100 kHz. To generate higher frequencies, the component used in a signal generator requires a higher slew rate and is more costly. A tablet system also consumes more power if its signal frequency is higher. Considering the trade-off, as illustrated in the FIG. 3, the frequency from 124 kHz to 173 KHz is selected as a preferred frequency bandwidth for this invention.

In a practical operation, the frequency of the signals from pointing devices may be affected by several factors such as induced frequency change due to an environment, a product adjustment tolerance, frequency detecting error tolerance and so on. The guard bands as shown in FIG. 3 assure that a frequency section can be clearly identified for the frequency detected from the received signal. The center frequencies of the guard bands are used to determine which frequency section a received signal belongs to.

FIG. 4 is a flowchart illustrating how an operation mode (absolute mode or relative mode) is determined when a pointing device is employed on the surface of a tablet system according to the present invention.

As shown in FIG. 4, at step 401, once the digitizer tablet system is turned on, the operation mode is initially preset in an absolute mode, assuming that the employed device is a cordless pen. The system starts from an initial point and scans both X-direction and Y-direction. It also calculates the frequency of the received signal (step 402).

To determine an operation mode when a pointing device is employed, at step 403, the frequency of the received signal is compared with the center frequency of the guard band that separates a cordless pen and a cordless mouse. If the frequency of the received signal is lower, then a cordless mouse mode is determined at step 404. Otherwise, the frequency of the received signal is further compared with the center frequency of the guard band that separates the first button of a cordless pen and the left button of a cordless mouse (step 405). If the frequency of the received signal is greater, then a cordless pen mode is determined at step 406. On the other hand, if the received signal frequency is lower, the mode of operation is not changed. In other words, the system continues the previous mode of operation (step 407).

Thus, it can be seen from the foregoing description that the present invention has truly met its stated objectives by providing a digitizer tablet system which can automatically characterize a pointing device for either a cordless mouse or a cordless pen. Also, it allows user selectively control the use of the pointing device as an absolute position device or as a relative movement device on the surface of the digitizer tablet system.

Although this invention has been described with a certain degree of particularity, it is to be understood that the present disclosure has been made by way of preferred embodiments only and that numerous changes in the detailed construction and combination as well as arrangement of parts may be restored to without departing from the spirit and scope of the invention as hereinafter set forth.

Claims (7)

What is claimed is:
1. A digitizer tablet system comprising:
a tablet and a first cordless pointing device, said first cordless pointing device generating an electromagnetic wave;
a detection loop sensing circuit for detecting an electromagnetic wave;
a signal processing circuit for processing the detected electromagnetic wave and generating a filtered signal;
a signal shaping circuit for shaping said filtered signal into a square wave signal;
a frequency divider for dividing the frequency of said square wave signal and generating a lower frequency square wave signal;
a micro-controller having an analog to digital converter;
a frequency counter for counting the frequency of said lower frequency square wave and sending the frequency count to said micro-controller; and
a half-wave rectifier for rectifying said filtered signal and sending a rectified signal to said analog to digital converter, said rectified signal being digitized and said micro-controller determining the location of said pointing device by processing said digitized signal.
2. A digitizer tablet system according to claim 1, said signal processing circuit comprising a band-pass filter for generating said filtered signal.
3. A digitizer tablet system according to claim 1, wherein the electromagnetic wave generated by said first cordless pointing device has a first frequency for indicating the operation of said first pointing device and a second frequency for indicating the press of a button on said first pointing device.
4. The digitizer tablet system according to claim 3, further comprising a second cordless pointing device, said second pointing device generating an electromagnetic wave having a different frequency as compared to the frequencies of the electromagnetic wave generated by said first pointing device, wherein said first pointing device operates in a first mode and said second pointing device operates in a second mode.
5. The digitizer tablet system according to claim 4, wherein said tablet system is adjusted between said first mode and said second mode automatically depending on the frequency count received by said micro-controller.
6. A method for detecting and changing the operation mode of a digitizer tablet system having first and second cordless pointing devices operating in first and second modes respectively, comprising the steps of:
presetting the operation of said tablet system to the first mode;
generating an electromagnetic wave in a first frequency band if a button of said first pointing device is pressed;
generating an electromagnetic wave in a second frequency band if said second pointing device is in operation, and an electromagnetic wave in a third frequency band if a button of said second pointing device is pressed, said first frequency band being between said second and third frequency bands, said first and second frequency bands having a first frequency guard band in between and said first and third frequency bands having a second frequency guard band in between;
receiving an electromagnetic wave in said tablet system;
determining the frequency of the received electromagnetic wave;
comparing the determined frequency with the center frequency of said first frequency guard band;
adjusting the operation of said tablet system to the second mode if the determined frequency and said second frequency band are on a same side with respect to said first frequency guard band, otherwise comparing the determined frequency with the center frequency of said second frequency band; and
adjusting the operation of said tablet system to the first mode if the determined frequency and said first frequency band are on a same side with respect to said second frequency guard band.
7. A method for detecting and changing the operation mode of a digitizer tablet system having first and second cordless pointing devices generating electromagnetic waves in first and second frequency bands respectively, said first and second frequency bands having a frequency guard band in between, comprising the steps of:
receiving an electromagnetic wave from said tablet system;
determining the frequency of the received electromagnetic wave; comparing the determined frequency with the center frequency of said frequency guard band;
adjusting said tablet system for operating in a first mode corresponding to said first pointing device if the determined frequency and said first frequency band are on a same side with respect to said frequency guard band; and
adjusting said tablet system for operating in a second mode corresponding to said second pointing device if the determined frequency and said second frequency band are on a same side with respect to said frequency guard band.
US09074640 1998-05-07 1998-05-07 Dual mode digitizer tablet system Expired - Fee Related US6180894B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US09074640 US6180894B1 (en) 1998-05-07 1998-05-07 Dual mode digitizer tablet system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US09074640 US6180894B1 (en) 1998-05-07 1998-05-07 Dual mode digitizer tablet system

Publications (1)

Publication Number Publication Date
US6180894B1 true US6180894B1 (en) 2001-01-30

Family

ID=22120734

Family Applications (1)

Application Number Title Priority Date Filing Date
US09074640 Expired - Fee Related US6180894B1 (en) 1998-05-07 1998-05-07 Dual mode digitizer tablet system

Country Status (1)

Country Link
US (1) US6180894B1 (en)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6377248B1 (en) 1999-09-30 2002-04-23 Tony S. Partow High voltage stylus for portable computer
US20020189869A1 (en) * 2001-06-19 2002-12-19 Chia-Jui Yeh Feedback peak detector fitted wireless handwriting tablet
US20030122786A1 (en) * 2001-12-31 2003-07-03 Ching-Chuan Chao Computer peripheral input system with two input types and method of data communication for the same
US6797895B2 (en) * 1999-05-25 2004-09-28 Silverbrook Research Pty Ltd Orientation sensing device with memory
US20050184973A1 (en) * 2004-02-25 2005-08-25 Xplore Technologies Corporation Apparatus providing multi-mode digital input
US20060071915A1 (en) * 2004-10-05 2006-04-06 Rehm Peter H Portable computer and method for taking notes with sketches and typed text
US20060262106A1 (en) * 2005-05-20 2006-11-23 Lg Electronics Inc. Pen input device with data storage
US20080157882A1 (en) * 2007-01-03 2008-07-03 Apple Inc. Automatic frequency calibration
US20080157893A1 (en) * 2007-01-03 2008-07-03 Apple Inc. Noise reduction within an electronic device using automatic frequency modulation
US20080180412A1 (en) * 2007-01-31 2008-07-31 Microsoft Corporation Dual mode digitizer
US20080264701A1 (en) * 2007-04-25 2008-10-30 Scantron Corporation Methods and systems for collecting responses
US20090322710A1 (en) * 2008-06-30 2009-12-31 Finepoint Innovations, Inc. Extent calibration for absolute input sensors
US20100302180A1 (en) * 2009-05-27 2010-12-02 Wintek Corporation Touch apparatus and touch sensing method
US20150048846A1 (en) * 2013-08-13 2015-02-19 Samsung Electronics Company, Ltd. Interaction Sensing
US20150062448A1 (en) * 2013-08-30 2015-03-05 Arvind S. Touch screen displays
US9602729B2 (en) 2015-06-07 2017-03-21 Apple Inc. Devices and methods for capturing and interacting with enhanced digital images
US9612741B2 (en) 2012-05-09 2017-04-04 Apple Inc. Device, method, and graphical user interface for displaying additional information in response to a user contact
US9619076B2 (en) 2012-05-09 2017-04-11 Apple Inc. Device, method, and graphical user interface for transitioning between display states in response to a gesture
US9645732B2 (en) 2015-03-08 2017-05-09 Apple Inc. Devices, methods, and graphical user interfaces for displaying and using menus
US9665206B1 (en) 2013-09-18 2017-05-30 Apple Inc. Dynamic user interface adaptable to multiple input tools
US9674426B2 (en) 2015-06-07 2017-06-06 Apple Inc. Devices and methods for capturing and interacting with enhanced digital images
US9753639B2 (en) 2012-05-09 2017-09-05 Apple Inc. Device, method, and graphical user interface for displaying content associated with a corresponding affordance
US9778771B2 (en) 2012-12-29 2017-10-03 Apple Inc. Device, method, and graphical user interface for transitioning between touch input to display output relationships
US9785305B2 (en) 2015-03-19 2017-10-10 Apple Inc. Touch input cursor manipulation
US9886184B2 (en) 2012-05-09 2018-02-06 Apple Inc. Device, method, and graphical user interface for providing feedback for changing activation states of a user interface object
US9959025B2 (en) 2012-12-29 2018-05-01 Apple Inc. Device, method, and graphical user interface for navigating user interface hierarchies
US9971499B2 (en) 2014-11-07 2018-05-15 Apple Inc. Device, method, and graphical user interface for displaying content associated with a corresponding affordance

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5557076A (en) * 1993-11-12 1996-09-17 Mikron Gesellschaft Fur Cordless position detection apparatus
US5600105A (en) * 1993-12-28 1997-02-04 Wacom Co., Ltd. Position detecting device and position pointing device therefor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5557076A (en) * 1993-11-12 1996-09-17 Mikron Gesellschaft Fur Cordless position detection apparatus
US5600105A (en) * 1993-12-28 1997-02-04 Wacom Co., Ltd. Position detecting device and position pointing device therefor

Cited By (55)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7187370B2 (en) 1999-05-25 2007-03-06 Silverbrook Research Pty Ltd Method for sensing the orientation of an object
US20090102794A1 (en) * 1999-05-25 2009-04-23 Silverbrook Research Pty Ltd Electronic pen with retractable nib
US20090095543A1 (en) * 1999-05-25 2009-04-16 Silverbrook Research Pty Ltd Electronic pen with retraction mechanism and force sensor
US8031177B2 (en) 1999-05-25 2011-10-04 Silverbrook Research Pty Ltd Electronic pen with retractable nib
US6797895B2 (en) * 1999-05-25 2004-09-28 Silverbrook Research Pty Ltd Orientation sensing device with memory
US20050062727A1 (en) * 1999-05-25 2005-03-24 Paul Lapstun Method for sensing the orientation of an object
US20050062728A1 (en) * 1999-05-25 2005-03-24 Paul Lapstun Sensing device for generating orientation indicating data
US20050088419A1 (en) * 1999-05-25 2005-04-28 Paul Lapstun Orientation sensing device
US7786978B2 (en) 1999-05-25 2010-08-31 Silverbrook Research Pty Ltd Sensing device having force and orientation sensors
US20070289784A1 (en) * 1999-05-25 2007-12-20 Silverbrook Research Pty Ltd Sensing device having force and orientation sensors
US7277085B2 (en) 1999-05-25 2007-10-02 Silverbrook Research Pty Ltd Orientation sensing device
US7245294B2 (en) 1999-05-25 2007-07-17 Silverbrook Research Pty Ltd Method for sensing the orientation of an object
US7982885B2 (en) 1999-05-25 2011-07-19 Silverbrook Research Pty Ltd Electronic pen with retraction mechanism and force sensor
US6377248B1 (en) 1999-09-30 2002-04-23 Tony S. Partow High voltage stylus for portable computer
US20020189869A1 (en) * 2001-06-19 2002-12-19 Chia-Jui Yeh Feedback peak detector fitted wireless handwriting tablet
US6717574B2 (en) * 2001-06-19 2004-04-06 Aiptek International Inc. Feedback peak detector fitted wireless handwriting tablet
US6930670B2 (en) * 2001-12-31 2005-08-16 Aiptek International Inc. Computer peripheral input system with two input types and method of data communication for the same
US20030122786A1 (en) * 2001-12-31 2003-07-03 Ching-Chuan Chao Computer peripheral input system with two input types and method of data communication for the same
WO2005082060A2 (en) 2004-02-25 2005-09-09 Xplore Technologies Corporation Apparatus providing multi-mode digital input
US20050184973A1 (en) * 2004-02-25 2005-08-25 Xplore Technologies Corporation Apparatus providing multi-mode digital input
EP1723632A2 (en) * 2004-02-25 2006-11-22 Xplore Technologies Corporation Apparatus providing multi-mode digital input
EP1723632A4 (en) * 2004-02-25 2007-07-25 Xplore Technologies Corp Apparatus providing multi-mode digital input
US20060071915A1 (en) * 2004-10-05 2006-04-06 Rehm Peter H Portable computer and method for taking notes with sketches and typed text
US20060262106A1 (en) * 2005-05-20 2006-11-23 Lg Electronics Inc. Pen input device with data storage
US20080157882A1 (en) * 2007-01-03 2008-07-03 Apple Inc. Automatic frequency calibration
US7986193B2 (en) 2007-01-03 2011-07-26 Apple Inc. Noise reduction within an electronic device using automatic frequency modulation
US7719367B2 (en) * 2007-01-03 2010-05-18 Apple Inc. Automatic frequency calibration
US20080157893A1 (en) * 2007-01-03 2008-07-03 Apple Inc. Noise reduction within an electronic device using automatic frequency modulation
US20080180412A1 (en) * 2007-01-31 2008-07-31 Microsoft Corporation Dual mode digitizer
US20080264701A1 (en) * 2007-04-25 2008-10-30 Scantron Corporation Methods and systems for collecting responses
US8358964B2 (en) 2007-04-25 2013-01-22 Scantron Corporation Methods and systems for collecting responses
US20090322710A1 (en) * 2008-06-30 2009-12-31 Finepoint Innovations, Inc. Extent calibration for absolute input sensors
US8427442B2 (en) * 2009-05-27 2013-04-23 Wintek Corporation Touch apparatus and touch sensing method
US20100302180A1 (en) * 2009-05-27 2010-12-02 Wintek Corporation Touch apparatus and touch sensing method
US9823839B2 (en) 2012-05-09 2017-11-21 Apple Inc. Device, method, and graphical user interface for displaying additional information in response to a user contact
US9753639B2 (en) 2012-05-09 2017-09-05 Apple Inc. Device, method, and graphical user interface for displaying content associated with a corresponding affordance
US9886184B2 (en) 2012-05-09 2018-02-06 Apple Inc. Device, method, and graphical user interface for providing feedback for changing activation states of a user interface object
US9612741B2 (en) 2012-05-09 2017-04-04 Apple Inc. Device, method, and graphical user interface for displaying additional information in response to a user contact
US9619076B2 (en) 2012-05-09 2017-04-11 Apple Inc. Device, method, and graphical user interface for transitioning between display states in response to a gesture
US9857897B2 (en) 2012-12-29 2018-01-02 Apple Inc. Device and method for assigning respective portions of an aggregate intensity to a plurality of contacts
US9959025B2 (en) 2012-12-29 2018-05-01 Apple Inc. Device, method, and graphical user interface for navigating user interface hierarchies
US9778771B2 (en) 2012-12-29 2017-10-03 Apple Inc. Device, method, and graphical user interface for transitioning between touch input to display output relationships
US9569055B2 (en) * 2013-08-13 2017-02-14 Samsung Electronics Company, Ltd. Interaction sensing
US20150049034A1 (en) * 2013-08-13 2015-02-19 Samsung Electronics Company, Ltd. Interaction Sensing
JP2016530629A (en) * 2013-08-13 2016-09-29 サムスン エレクトロニクス カンパニー リミテッド Interaction sensing
US20150048846A1 (en) * 2013-08-13 2015-02-19 Samsung Electronics Company, Ltd. Interaction Sensing
CN104969157A (en) * 2013-08-13 2015-10-07 三星电子株式会社 Interaction sensing
US20150062448A1 (en) * 2013-08-30 2015-03-05 Arvind S. Touch screen displays
US9665206B1 (en) 2013-09-18 2017-05-30 Apple Inc. Dynamic user interface adaptable to multiple input tools
US9971499B2 (en) 2014-11-07 2018-05-15 Apple Inc. Device, method, and graphical user interface for displaying content associated with a corresponding affordance
US9645732B2 (en) 2015-03-08 2017-05-09 Apple Inc. Devices, methods, and graphical user interfaces for displaying and using menus
US9785305B2 (en) 2015-03-19 2017-10-10 Apple Inc. Touch input cursor manipulation
US9860451B2 (en) 2015-06-07 2018-01-02 Apple Inc. Devices and methods for capturing and interacting with enhanced digital images
US9674426B2 (en) 2015-06-07 2017-06-06 Apple Inc. Devices and methods for capturing and interacting with enhanced digital images
US9602729B2 (en) 2015-06-07 2017-03-21 Apple Inc. Devices and methods for capturing and interacting with enhanced digital images

Similar Documents

Publication Publication Date Title
US6313825B1 (en) Virtual input device
US6927384B2 (en) Method and device for detecting touch pad unit
US4682159A (en) Apparatus and method for controlling a cursor on a computer display
US6610936B2 (en) Object position detector with edge motion feature and gesture recognition
US7088342B2 (en) Input method and input device
US20050253818A1 (en) Method of interpreting control command, and portable electronic device
US20050003851A1 (en) Radio system with touch pad interface
US6028594A (en) Coordinate input device depending on input speeds
US5543591A (en) Object position detector with edge motion feature and gesture recognition
US20040178995A1 (en) Apparatus for sensing the position of a pointing object
US4987411A (en) Pointing apparatus
US20070097093A1 (en) Pad type input device and scroll controlling method using the same
US5120907A (en) Device for determining position coordinates of points on a surface
US5334805A (en) Controller for an acoustic wave touch panel
US6289207B1 (en) Computerized radio receiver
US7532205B2 (en) Object position detector with edge motion feature and gesture recognition
US5977959A (en) Position pointing device
US20090174675A1 (en) Locating multiple objects on a capacitive touch pad
US5892501A (en) Three dimensional wireless pointing device
US20090058818A1 (en) Device and method for determining touch position on sensing area of capacitive touch panel
US20080084789A1 (en) Acoustic Robust Synchronization Signaling for Acoustic Positioning System
US5247138A (en) Cordless digitizer stylus status encoding and transmission scheme
US8164573B2 (en) Systems and methods for adaptive interpretation of input from a touch-sensitive input device
WO2012050069A1 (en) Coordinate input device, display device provided with coordinate input device, and coordinate input method
US5594215A (en) Wireless digitizer and stylus pen unit

Legal Events

Date Code Title Description
AS Assignment

Owner name: AIPTEK INTERNATIONAL INC., TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHAO, CHING-CHUAN;YEH, CHIA-JUI;REEL/FRAME:009160/0982

Effective date: 19980501

FPAY Fee payment

Year of fee payment: 4

AS Assignment

Owner name: WALTOP INTERNATIONAL CORP., TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AIPTEK INTERNATIONAL INC.;REEL/FRAME:017344/0661

Effective date: 20060120

FPAY Fee payment

Year of fee payment: 8

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Expired due to failure to pay maintenance fee

Effective date: 20130130